Restarting the browser or using Ctrl+F5 to force reload the webpage and then starting the download again might also help if it is a incomplete download and not a problem with the file format due to older extraction programs or such.

Added the option to disable the aim assist zoom and reticle independently of difficulty setting (the multiplayer aim assist setting will override this, as will Authentic difficulty). Removed limits on raw mouse input data – which should hopefully address the “negative mouse acceleration” issue. Added "Autobalance" as a team-based multiplayer option (will automatically move players from one team to another on death if the number of players become imbalanced). Added quicksave (F5) and quickload (F9) on button press. New profiles will attempt to detect keyboard layouts other than qwerty and set default controls accordingly (we're currently only supporting a small subset of variant keyboards, primarily azerty and qwertz layouts; please get in touch with our support department if you see any issues). Dedicated Server gains "kickindex" and "kickbanindex" commands (which were already documented but were lost between V2 and SE3). Added a "windowed" tickbox to the launcher options. Fix co-op desync due to bulletcams (bullet cams are now sychronised where they're supposed to play for both, and we prevent weapons firing multiple times for the non-bulletcam-viewing player in non synchronised cases). Fix co-op desync when getting on turrets. Bleedout countdown notifications should now display correctly for both players in co-op (when difficulty setting allows). Added latency indicators to the scoreboard in multiplayer. "Through The Looking Glass" should trigger correctly. DLC collectibles/achievements no longer counted against campaign progress. A few leaves should no longer be able to stop gunfire, but AI rifles should be slightly less likely to shoot through solid objects and be slightly less accurate. Bullets should emerge from the gun's muzzle regardless of the shadow setting! Incapacitation on uneven surfaces should be slightly more robust. Various fixes to prevent ragdolls interpenetrating surfaces. Driver killcams made more robust (driver no longer killed when hits are near the view-slot, and killcams are triggered more reliably when the shot does hit the view-slot). Tweaked dialogue audio settings to improve spatialisation. Airfield's rescued prisoners no longer pose awkwardly. Ghost Town now has more consistency in vaults over walls, building walls should no longer allow grenades through, and hiding below the ground surface should be slightly less likely. Rat Run no longer has a building that partially disappears depending upon viewing angle/location. Ruins and Beachhead should have fewer levitating rocks and plants! DLC weapons now have names in Czech again.

Notes:

Steam cloud is unfortunately still not working. Co-op for DLC missions is also unfortunately delayed to the next patch. Disabling aim assist doesn't disable the tutorial messages about using the aim assist.

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What with Early-access, multiple sources (GOG, Steam.) rushed releases even from established publishers / developers and numerous patches it must be quite hectic trying to keep the trainers up to date so I understand if it takes a while before it's available. (Usually I'm glad they're patching issues quickly but when you have games like Rome 2, Van Helsin, UnEpic or Skullgirls getting up to near daily tweaks and still being buggy months after release it can't be easy to keep up with all that or how to say, that you're still updating the trainers is greatly appreciated.)

(Even the early access games sometimes require months of post-release updates.)